如何获取 Mac OS 上的视频捕获设备（网络摄像头）列表？ (C++)

发布于 2024-10-09 01:04:53 字数 1163 浏览 7 评论 0原文

所以我需要的很简单 - 当前可用的视频捕获设备（网络摄像机）的列表。我需要它在简单或 C++ 控制台应用程序中。我所说的列表是指类似控制台输出的内容：

1) Asus Web Camera
2) Sony Web Camera

看起来很简单，但我有一个要求 - 尽可能多地使用本机操作系统 api - 没有外部库 - 毕竟 - 我们想要的只是打印出一个列表 - 不是飞行登上月球！）（请不要使用 Objective-C - 纯 C/C++）

如何做这样的事情？

也来自本系列：

如何获取 Linux 上的视频捕获设备列表？和有关获取相机名称的特殊详细信息以及经过测试的正确答案
如何获取 Mac OS 上的视频捕获设备列表？正确，不正确尚未通过我的答案进行测试
如何获取 Windows 上的视频捕获设备列表？提供经过测试的正确答案
如何使用 Qt（跨平台）获取视频捕获设备名称列表？

原文

So all I need is simple - a list of currently avaliable video capture devices (web cameras). I need it in simple or C++ console app. By list I mean something like such console output:

1) Asus Web Camera
2) Sony Web Camera

So It seems simple but I have one requirement - use of native OS apis as much as possible - no external libs - after all - all we want is to print out a a list - not to fly onto the moon!) (and no use of objective-C, please - pure C/C++)

How to do such thing?

also from this series:

How to get a list of video capture devices on linux? and special details on getting cameras NAMES with correct, tested answers
How to get a list of video capture devices on Mac OS? with correct, not yet tested by my answers
How to get a list of video capture devices on windows? with correct, tested answers
How to get a list video capture devices NAMES using Qt (crossplatform)?

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So要识趣 2024-10-16 01:04:53

您需要使用 SGGetChannelDeviceList，它是 QuickTime C API 的一部分。每个设备可以有多个输入。解析它的正确方法是这样的：

    // first get a video channel from the sequence grabber

   ComponentDescription    theDesc;
   Component               sgCompID;
   ComponentResult         result;
   theDesc.componentType           = SeqGrabComponentType;
   theDesc.componentSubType        = 0L;
   theDesc.componentManufacturer   = 'appl';
   theDesc.componentFlags          = 0L;
   theDesc.componentFlagsMask      = 0L;   
   sgCompID = FindNextComponent (NULL, &theDesc);
   seqGrabber = OpenComponent (sgCompID);
   result = SGInitialize (seqGrabber);
   result = SGNewChannel (seqGrabber, VideoMediaType, &videoChannel);
   SGDeviceList  theDevices;
   SGGetChannelDeviceList(videoChannel, sgDeviceListDontCheckAvailability | sgDeviceListIncludeInputs, &theDevices);

    if (theDevices)
    {
        int theDeviceIndex;
        for (theDeviceIndex = 0; theDeviceIndex != (*theDevices)->count; ++theDeviceIndex)
        {
            SGDeviceName theDeviceEntry = (*theDevices)->entry[theDeviceIndex];
            // name of device is a pstring in theDeviceEntry.name

        SGDeviceInputList theInputs = theDeviceEntry.inputs;
            if (theInputs != NULL)
            {
                int theInputIndex;
                for ( theInputIndex = 0; theInputIndex != (*theInputs)->count; ++theInputIndex)
                {
                    SGDeviceInputName theInput = (*theInputs)->entry[theInputIndex];
                    // name of input is a pstring in theInput.name
                }
            }
        }       
    }

You need to use SGGetChannelDeviceList, which is part of the QuickTime C API. Each device can have multiple inputs. The proper way to parse it is like this:

    // first get a video channel from the sequence grabber

   ComponentDescription    theDesc;
   Component               sgCompID;
   ComponentResult         result;
   theDesc.componentType           = SeqGrabComponentType;
   theDesc.componentSubType        = 0L;
   theDesc.componentManufacturer   = 'appl';
   theDesc.componentFlags          = 0L;
   theDesc.componentFlagsMask      = 0L;   
   sgCompID = FindNextComponent (NULL, &theDesc);
   seqGrabber = OpenComponent (sgCompID);
   result = SGInitialize (seqGrabber);
   result = SGNewChannel (seqGrabber, VideoMediaType, &videoChannel);
   SGDeviceList  theDevices;
   SGGetChannelDeviceList(videoChannel, sgDeviceListDontCheckAvailability | sgDeviceListIncludeInputs, &theDevices);

    if (theDevices)
    {
        int theDeviceIndex;
        for (theDeviceIndex = 0; theDeviceIndex != (*theDevices)->count; ++theDeviceIndex)
        {
            SGDeviceName theDeviceEntry = (*theDevices)->entry[theDeviceIndex];
            // name of device is a pstring in theDeviceEntry.name

        SGDeviceInputList theInputs = theDeviceEntry.inputs;
            if (theInputs != NULL)
            {
                int theInputIndex;
                for ( theInputIndex = 0; theInputIndex != (*theInputs)->count; ++theInputIndex)
                {
                    SGDeviceInputName theInput = (*theInputs)->entry[theInputIndex];
                    // name of input is a pstring in theInput.name
                }
            }
        }       
    }

回复收藏 0 原文

秋意浓 2024-10-16 01:04:53

显然你可以在终端中使用system_profiler SPUSBDataType
这就是答案：

USB:

    USB 3.1 Bus:

      Host Controller Driver: AppleT8103USBXHCI

        USB Camera-OV580:

          Product ID: 0x058a
          Vendor ID: 0x05a9  (OmniVision Technologies, Inc.)
          Version: 1.00
          Speed: Up to 5 Gb/s
          Manufacturer: Omnivision Technologies, Inc.
          Location ID: 0x01200000 / 1
          Current Available (mA): 900
          Current Required (mA): 512
          Extra Operating Current (mA): 0

    USB 3.1 Bus:

      Host Controller Driver: AppleT8103USBXHCI

clearly you can use system_profiler SPUSBDataType in terminal
that is the answer:

USB:

    USB 3.1 Bus:

      Host Controller Driver: AppleT8103USBXHCI

        USB Camera-OV580:

          Product ID: 0x058a
          Vendor ID: 0x05a9  (OmniVision Technologies, Inc.)
          Version: 1.00
          Speed: Up to 5 Gb/s
          Manufacturer: Omnivision Technologies, Inc.
          Location ID: 0x01200000 / 1
          Current Available (mA): 900
          Current Required (mA): 512
          Extra Operating Current (mA): 0

    USB 3.1 Bus:

      Host Controller Driver: AppleT8103USBXHCI

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